Damper-controlling mechanism.



FRIEND A. MAOMURTRY, OF NORTH BENNINGTON, VERMONT.

DAMPER-CONTROLLING MECHANISM;

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application tiled April 25, 1916. Serial No. 93,356.

To all 'whom it may concern:

Be it known that I, FRIEND A. MACMUR- TRY, a citizen of the United States, and resident of North Bennington, county of Bennington, and State of Vermont, have invented certain new and useful Improvements in Damper- Controlling Mechanisms, of which the :following is a specification.

My invention relates to mechanisms for automatically controlling the dampers commonly located in the smoke pipes or iiues of heating furnaces or other apparatus and has for its object to provide a simple and eiicient arrangement whereby said dampers may be properly operated in u nison with any other means which may be included in the heating apparatus for the purpose of controlling the source of heat therein. My improvement will be fully described hereinafter and the features of novelty will be pointed out in the appended claim.

In the accompanying drawings I have illustrated my invention in combination with a heating apparatus for incubators, it being understood that this is only an eXample used for illustrative purposes. In saiddrawings Figure 1 is anelevation, partly in section of an incubator and its heating apparatus with my improvement operatively combined therewith; Fig. 2 is a detail view, partly in section, of a specific example of my improvement; Fig. 3 is a view thereof looking. at right angles to Fig. 2 and Fig. 4 1s a section on the line 4 4 of Fig. 3.

In the drawings 5 represents a furnace which may be of any suitable construction adapted for the particular purpose in hand and which in the illustration is provided with a water-jacket 6 connected by means of the pipes 7 and 8 with the heating system which may also be of yany well known type and located at any place or places where the heating effect thereof is desired. In the illustrated example I have shown the pipes 7 and 8 leading to a heating system located in thc interior of an incubator 9 which is diagrammatically indicated in the drawings as the details of its construction form no part of the present invention. The furnace 5 as shown, is constructed with a top chamber 10 and further includes a. hinged damper 11 whereby the admission of cold air to the chamber 10 is controlled, the latter communieating with the chimney by way of the stove-pipe 12. The chamber 10 is connected with the fire pot 1.3 of the furnace by means of a passage 10a with Which aI throttle or damper 14 coperates to control the products of combustion from the fire pot 13. The means for operating the dampers 11 and 14 in the illustrated example comprises a receptacle 15 supported for instance at a distance above the furnace in any suitable manner and connected by means of a pipe 16 with the pipe S whereby heated water is conducted to and maintained in said receptacle 15. A piston or fioat 17 is tted within said receptacle 15 so as to be slidable therein and carries a' stem 18 operatively connected with a pivoted lever 19 which in turn is connected by means of alink 20 with the damper 11. The illustrated arrangement further includes a rod or the like 21 whereby the throttle 14 is also operatively connected with said stem 18 and thus with the piston or Hoat 17. The parts so far described form no part of Imy present invent-i011 and have simply been utilized for the purposes of illustration, the details of construction and the operation of the parts being clearly set forth in Patent No. 69227 7 issued to iVilbur P. Hall on Febi'uary 4, 1.902.

My invention as shown in the illustrated example comprises a plate or member 22 having a curved or cam slot 23 formed therein, said plate being adjustably and detachably connected with the rod 21 in any suitable manner as by clamps 24. An arm 25 extending at an angle to and preferably forming part' of a. member 26 slotted at 27 extends through the slot 23, the member 26 being adju-stably connected, for instance by means of nuts and bolts 28 passing through the slot 27 with the actuating member 29 of the smoke pipe damper 30 rotatably mounted in the pipe 12 as shown in Figs. 2 and 4. The member 29 may as shown, comprise the usual handle whereby such dampers are ordinarily operated manually or if desired said member may be specially constructed to meet the requirements of any special conditions. As shown in Fig. 2 guides 81 may in some cases bc provided through which the rod 21 or its equivalent extends so as to be slidable relatively thereto, said guides 31 extending for instance from the pipe 12 at points above and below the damper 29.

It will be understood that the water in the jacket 6 is acted upon by the furnace fire and as the intensity of the fire changes, is vsuccessively increased and diminished in temperature and thus successively expands and contracts, and communicates this effect, through the pipe 16 to thewater in the receptacle whereby the piston or float 17 will periodically rise and fall in the recepconstructed to produce these results as clearly 11 is closed.

shown and described in the Hall patent hereinbefore referred to. Thus as the fire in the furnace becomes hotter and the liquid in the jacket 6, pipe 16 and receptacle 15 is caused to expand, the damper 14 will be closed and the check draft damper 11 will be opened whereby the draft through the furnace will be reduced and at the same time air will pass int-o Ithe chamber 1() and over the fire pot 13 through the open draft damper 11. This brings about a reduction in the intensity of the fire so that eventually the piston 17 will drop due to the contraction of the water in the receptacle 15 and the damper 14 will be opened while the draft damper will be closed so that the heat-ing effect of the fire is again increased. As the rod 21 rises and falls as described the late E22 or its equivalent will be carried a ong and through the coperation of the slot 23 and arm 25 will bring about an operation yof the flue damper 30. In other words the actuation of the flue damper 30 will correspond to the actuation of the damper 14 so that both of these dampers `are concurrently fully closed or fully open or occupy corresponding intermediate posit-ions.

I have found that attempted regulation of the source of heat without the cooperation of the flue damper does not produce entirely reliable results as it is obvious that, with a free passage in the smoke iue 12 and with the draft damper 11 open, the air rushing into the chamber 10 quickly becomes heated Vespecially if drawn from a warm room and continues to act for a time at least as a draft tending to maintain the intensity of the iire in the furnace, with a consequent loss of heat Afrom the re and a waste of fuel. v On the oth-er hand if a manually operated damper is provided and the same is permitted to remain partly or fully closed for instance to offset the above mentioned objections, the fire does niot become intensified quickly when the; damper 14 is opened and the draft damper This ofttimes results in an undesired and considerable drop in temperature at the place or places being heated.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

These objections are entirely overcome with my improvement which by being operatively combined with the other regulating devices augmente the action thereof and coperates therewith to quickly check the fire when desired and to bring about'a rapid intensification thereof at the proper time. My improvements thus provide for the desired regulation of temperature in an efficient and reliable manner and results in a saving of fuel without affecting the efficiency of the heating plant and at the same time securing. a substantially even fire and a substantially constant degree of heat therefrom with a substantially constant temperature at the place or places being heated.

r1`he device may be readily combined with existing constructions without reqiiiring any material changes or additions either in or to the furnace regulating means if such is included in the plant or in the iue damper arrangement and structure, and is adjustable in all cases to produce the desired results. It will be'obvious that the plate 22 with its slot 23 or equivalent devices may be operatively combined with elements other than the rod 21, this being determined by the charac-k ter of the particular regulating devices and means for operating same which are included in the particular heating plant with which my improvement is to be combined. It will further be apparent that said improvement is not limited to use in connection with heating apparatus for incubators but may be efliciently combined with many other types of apparatus intended forI heating places other than incubators.

Various changes in the specific form shown and described may be made within the scope of the claim without departing from the spirit of my invention.

I claim:

The combination of a furnace, a smoke flue connected therewith, automatically operating means for regulating said furnace, a damper rotatably mounted in said smoke Hue and having an actuating member extended eX- teriorly thereof, a slotted member adjust-v ably connected with said actuating member. an arm forming a continuation of said slotted member and extending at an angle thereto7 a member adjustably connected with the regulating means and provided with a cam slot operatively combined with said arm and arranged to actuate the same whereby said damper is operated coincidentally with said regulating means.

In testimony whereof I have hereunto set my hand.

FRIEND A. MACMURTRY.

Washington, D. C. 

